dOPCIntf.TdOPCBrowseItem.NodeId

Stores the NodeId of the OPC UA server as string

Delphi

property NodeId: string;

C++

__property AnsiString NodeId;

Parameters

Parameters	Description
Value	Name, number or GUI of the NodeId
IdentifierType	A flag that specifies the identifier type. The flag has the following values: i= NUMERIC (UInteger) s= STRING (String) g= GUID (Guid) b= OPAQUE (ByteString)
NamespaceIndex	Number of namespace (default is '0')

Description

Stores the NodeId of the OPC UA server as string. The NodeId under OPC UA is normally a object with following properties:

Value

IdentifierType

NamespaceIndex

To be compatible with OPC classic and OPC XML where all OPC item tags are strings, we decided to use also strings for OPC UA node ids.

the format is: ns=<NamespaceIndex>;<IdentifierType>=<Value>

Example

Copy Code

procedure AddNode(OPCClient: TdOPCDAClient); var NodeString : string; Value : string; IdentifierType: string; NamespaceIndex: integer; begin Value := 'Triangle1'; // String value IdentifierType := 's'; // value is string NamespaceIndex := 5; // given namespace NodeString := format('ns=%d;%s=%s',[NamespaceIndex,IdentifierType,Value); // result is ns=5;s=Triangle1 // and this is the way how you has to define NodeIds if you work with the dOPCDAClient component OPCClient.OPCGroups[0].OPCItems.AddItem(NodeString); ShowMessage(NodeString) end;

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